v3.26.1
Segment Disclosures - Analysis and Reconciliation of Reportable Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]        
Sales $ 1,755 $ 1,763 $ 3,433 $ 3,623
Consolidated other costs 1,733 1,833 3,529 3,627
Consolidated operating income (loss) 22 (70) (96) (4)
Interest expense, net 57 58 114 119
Non-service components of net periodic benefit cost 0 (3) (7) (7)
Loss before income taxes (35) (125) (203) (116)
Income tax expense (benefit) 21 (49) 21 (46)
Net Income (Loss) (56) (76) (224) (70)
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Sales 1,779 1,783 3,482 3,668
Consolidated other costs 1,695 1,808 3,433 3,573
Operating Segments [Member] | Communication Papers [Member]        
Segment Reporting Information [Line Items]        
Sales 543 561 1,081 1,182
Operating Segments [Member] | Specialty and Packaging Papers [Member]        
Segment Reporting Information [Line Items]        
Sales 347 293 679 619
Operating Segments [Member] | Market Pulp [Member]        
Segment Reporting Information [Line Items]        
Sales 363 437 745 913
Operating Segments [Member] | Linerboard [Member]        
Segment Reporting Information [Line Items]        
Sales 78 56 151 114
Operating Segments [Member] | Newsprint [Member]        
Segment Reporting Information [Line Items]        
Sales 74 84 139 165
Operating Segments [Member] | Tissue [Member]        
Segment Reporting Information [Line Items]        
Sales 58 56 120 117
Operating Segments [Member] | Wood [Member]        
Segment Reporting Information [Line Items]        
Sales 292 276 518 513
Operating Segments [Member] | Paper And Packaging [Member]        
Segment Reporting Information [Line Items]        
Sales 914 899 1,821 1,902
Consolidated other costs 822 879 1,678 1,787
Consolidated operating income (loss) 85 12 131 99
Operating Segments [Member] | Pulp and Tissue [Member]        
Segment Reporting Information [Line Items]        
Sales 572 608 1,142 1,253
Consolidated other costs 587 663 1,236 1,281
Consolidated operating income (loss) (31) (67) (130) (57)
Operating Segments [Member] | Wood Products [Member]        
Segment Reporting Information [Line Items]        
Sales 293 276 519 513
Consolidated other costs 286 266 519 505
Consolidated operating income (loss) 6 10 (1) 8
Intersegment Sales [Member]        
Segment Reporting Information [Line Items]        
Sales (24) (20) (49) (45)
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Consolidated other costs 38 25 96 54
Consolidated operating income (loss) $ (38) $ (25) $ (96) $ (54)